#include<fstream.h>
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n,a,b,i;
 int main()
{
 f>>n;
 for(i=1;i<=n;i++)
  { f>>a>>b;
  while(a!=b)
   if(a>b) a-=b;
   else
    b-=a;
    g<<b<<"\n";
  }
 return 0;   
 }